package org.openslx.dozmod.thrift;

import java.util.HashSet;
import java.util.Set;

import org.apache.log4j.Logger;
import org.apache.thrift.TException;
import org.openslx.bwlp.thrift.iface.ImagePermissions;
import org.openslx.bwlp.thrift.iface.LecturePermissions;
import org.openslx.bwlp.thrift.iface.SatelliteConfig;
import org.openslx.bwlp.thrift.iface.WhoamiInfo;
import org.openslx.sat.thrift.version.Feature;
import org.openslx.thrifthelper.ThriftManager;

public class Session {

	private static final Logger LOGGER = Logger.getLogger(Session.class);

	private static WhoamiInfo data = null;

	private static String satelliteAddress = null;

	private static String satelliteToken = null;

	private static String masterToken = null;

	private static long satelliteApiVersion = -1;

	private static SatelliteConfig satConf = null;
	
	private static Set<Feature> features = null;

	public static synchronized void initialize(WhoamiInfo whoami, String satAddress, String satToken, String masToken,
			long satApiVersion) {
		if (whoami == null || whoami.user == null || whoami.user.userId == null) {
			throw new IllegalArgumentException(
					"Cannot initialize session: whoami-Information from satellite incomplete");
		}
		if (data != null && !data.user.userId.equals(whoami.user.userId))
			throw new IllegalArgumentException("Cannot set new session data with different user id");
		if (satelliteAddress != null && !satelliteAddress.equals(satAddress))
			throw new IllegalArgumentException("Cannot set new session data with different satellite address");
		data = whoami;
		masterToken = masToken;
		satelliteToken = satToken;
		satelliteAddress = satAddress;
		satelliteApiVersion = satApiVersion;
	}

	/**
	 * @return the first name
	 */
	public static String getFirstName() {
		if (data == null)
			return null;
		return data.user.firstName;
	}

	/**
	 * @return the last name
	 */
	public static String getLastName() {
		if (data == null)
			return null;
		return data.user.lastName;
	}

	/**
	 * @return the eMail
	 */
	public static String getEMail() {
		if (data == null)
			return null;
		return data.user.eMail;
	}

	/**
	 * @return the user id
	 */
	public static String getUserId() {
		if (data == null)
			return null;
		return data.user.userId;
	}

	/**
	 * @return the organization id
	 */
	public static String getOrganizationId() {
		if (data == null)
			return null;
		return data.user.organizationId;
	}

	/**
	 * @return whether user is superuser (has all permissions on everything, can
	 *         declare an image a template)
	 */
	public static boolean isSuperUser() {
		if (data == null)
			return false;
		return data.isSuperUser;
	}

	/**
	 * @return whether user can see list of images. students will only be able
	 *         to list lectures
	 */
	public static boolean canListImages() {
		if (data == null)
			return false;
		return data.canListImages;
	}

	/**
	 * @return the satellite token
	 */
	public static String getSatelliteToken() {
		return satelliteToken;
	}

	/**
	 * @return the master token
	 */
	public static String getMasterToken() {
		return masterToken;
	}

	/**
	 * @return the satelliteAddress
	 */
	public static String getSatelliteAddress() {
		return satelliteAddress;
	}

	/**
	 * @return the satellite server's API version
	 */
	public static long getSatApiVersion() {
		return satelliteApiVersion;
	}

	/**
	 * @return true if the satellite's API version supports publications of
	 *         images (version 3 and above), false otherwise
	 */
	public static boolean isImagePublishSupported() {
		return satelliteApiVersion >= 3;
	}

	/**
	 * @return true if the satellite's API version supports usb, netrules, internet
	 *         blocking, exam mode restrictions (version 4 and above), false otherwise
	 */
	public static boolean isLectureRestrictionsSupported() {
		return satelliteApiVersion >= 4;
	}

	/**
	 * Query the satellite server for its configuration and default values.
	 * 
	 * @return
	 */
	public static SatelliteConfig getSatelliteConfig() {
		synchronized (SatelliteConfig.class) {
			if (satConf != null)
				return satConf;
			try {
				satConf = ThriftManager.getSatClient().getConfiguration();
				return satConf;
			} catch (TException e) {
				LOGGER.warn("Could not get satellite configuration, falling back to builtin defaults", e);
				SatelliteConfig satConfig = new SatelliteConfig();
				satConfig.setDefaultImagePermissions(new ImagePermissions(true, true, false, false));
				satConfig.setDefaultLecturePermissions(new LecturePermissions(false, false));
				satConfig.setMaxImageValidityDays(200);
				satConfig.setMaxLectureValidityDays(100);
				satConfig.setPageSize(200);
				return satConfig;
			}
		}
	}

	public static boolean canExtendImageExpiry() {
		return isSuperUser() && satelliteApiVersion >= 3;
	}

	public static boolean hasFeature(Feature feature) {
		synchronized (Feature.class) {
			if (features == null) {
				String ret;
				try {
					ret = ThriftManager.getSatClient().getSupportedFeatures();
				} catch (TException e) {
					return false;
				}
				if (ret == null)
					return false;
				features = new HashSet<>();
				for (String f : ret.split(" ")) {
					try {
						features.add(Feature.valueOf(f));
					} catch (Throwable t) {}
				}
			}
			return features.contains(feature);
		}
	}

}